AVX2 SGR (looprestoration) implementation

Total decoding time for first 1000 frames of TwxVOYxoukU:

after: 0m3.761s
before: 0m6.868s

Cycle times:

selfguided_3x3_8bpc_c: 438865.8
selfguided_3x3_8bpc_avx2: 112522.6
selfguided_5x5_8bpc_c: 326938.3
selfguided_5x5_8bpc_avx2: 75850.1
selfguided_mix_8bpc_c: 755980.5
selfguided_mix_8bpc_avx2: 195930.3

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• ba7e1798 - Simplify SGR C code
• cbf8ba47 - Add AVX2 implementation for SGR looprestoration

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• 85277b75 - Add AVX2 implementation for SGR looprestoration

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mentioned in issue #78

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• 4f6979d2 - Add AVX2 implementation for SGR looprestoration

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• 06adf20e - Add AVX2 implementation for SGR looprestoration

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added 21 commits

• 06adf20e...aa5f55b2 - 18 commits from branch videolan:master
• 4dcc0b6e - Add unit test for SGR looprestoration
• 1993ecbe - Simplify SGR C code
• 7fafe6f7 - Add AVX2 implementation for SGR looprestoration

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• 9bf8d155 - Add AVX2 implementation for SGR looprestoration

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• c6fe27cd - 1 commit from branch videolan:master
• 7d1d7d28 - Add unit test for SGR looprestoration
• bfdfd1aa - Simplify SGR C code
• 4a499fd5 - Add AVX2 implementation for SGR looprestoration

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